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4. TROUBLE SHOOTING
R220
U207
HEADSET_MIC_N
HEADSET_MIC_P
HEADSET_SPK_P
C237
39p
JACK_DET
MAX9075EXK-T
U102
AD6521
R224
U205
U208
C240
R223
2V5_JACK
C232
R219 20K
C250
0.1u
R229
20K
C234
C235
33u
0.1u
39p
C236
0.1u
2V8_VMEM
2V8_VMEM
R223
1M
5
4
VIN-
1
VCC
OUT
3
GND
VIN+
C240
2
R220
47p
U207
620K
A10
AFCDAC
AFC
H9
RAMPDAC
A8
REFCAP
A7
REFOUT
A6
AUXADC1
A5
AUXADC2
B5
AUXADC3
BOARD_TEMP
A4
C112
C113
AUXADC4
MON_VBAT
39p
0.1u
H10
VINAUXP
G10
VINAUXN
J10
VINNORP
K10
VINNORN
C122
C123
C124
39p
39p
39p
J6
BUZZER
K8
VOUTNORP
K7
VOUTNORN
K9
VOUTAUXP
K6
C126
VOUTAUXN
C129
C130
39p
39p
0.1u
J201
R226
C232
R223
Figure 4-28
R218
2V8_VMEM
2V8_VMEM
2.2K
R221
R222
3.3K
1M
5
VIN-
4
VCC
VIN+
3
OUT
GND
2
R214
U205
330K
MAX9075EXK-T
(1608)
C251
R224
10u
4.7
R226
4.7
C239
R227
C260
1M
NA
47p
2V8_VMEM
TX_RAMP
R103
120K
R105
1K
R106
C111
C114
C115
C116
82K
39p
10p
1u
39p
(1608)
CLOSE TO AD6521
HEADSET_MIC_P
HEADSET_MIC_N
R109
MIC_P
C120
100
39p
R111
C121
0.1u
MIC_N
C125
100
39p
CLOSE TO AD6521
REC_P
REC_N
HEADSET_SPK_P
- 72 -
C233
39p
1
HOOK_DET
J201
5
1
3
4
2
VA203
VA204
Headset jack
AVL14K02200
AVL14K02200
SP203
SP204
SP205
Circuit Diagram 4-19
COMPASS_OUT
BAT_TEMP
Circuit Diagram 4-20
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